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(No Model.)

' B.. W. RUMMELL.

BLLIPSUGRAPH.

No. 333,972. Patented Jan. 5, 1886.

Jgwenon 33% Mz@ w .orneyaiv N4 PETERS. Phow-Lilhognpher. Walhngan. [LCV Nirnn rares RICHARD W. BUMMELL, OF BUFFALO, NEWT YORK.

ELLIPSOGRAPH.

SPECIFICATION forming part of Letters Patent No. 333,972, dated January 5, 1886.

Application filed May 5, 1885. Serial No. 164,513. (No model.)

To all whom it may concern.-

Beit known that I, RICHARD W. RUMMELL, of the city of Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Ellipsographs, of which the following is a specification.

This invention relates to an improvement in that class of ellipsographs which are composed of a standard or pivot on which the marking mechanism turns, and which is pro vided with a stationary gear-wheel, from which motion is transmitted by intermediate gears to the arm which carries the scriber or marking-point.

The object of this invention is to produce a simple and reliable machine of this character which can be easily adjusted for describing ellipses of different sizes and forms.

My invention consists, to that end, of the improvements which will be hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure l represents a side elevation of my improved .niachine. Fig. 2 is an end elevation thereof. Fig. 3 is a diagram illustrating the relative positions of the parts at different points of the ellipse.

A represents the center post or standard of the machine, provided at its lower end with spurs or pointed feet a, which hold the post against turning. The postA is preferably pivoted to the spurs a by a screw, a.

B represents a frame or bracket, which turns loosely on the standard A. rIhis frame is composed of a horizontal bar, b, carrying at its inner end a bifurcated frame, b', which is provided with bearings b2 b3, by which the frame B turns on the standard A.

C represents a horizontal shaft, supported at one end in a bearing, c, formed in the frame b', and at its opposite end in a bearing, c', which is formed in a standard, 02. The latter is provided at its lower end with a sleeve, c, by which it is adjustably supported on the horizontal bar b, it being secured in position thereon by a set-screw, 0*.

D represents a bevel-wheel secured to the inner end of the shaft C, and meshing with a similar wheel, E, which is rigidly secured to the standard A, so that by swinging the frame B on the standard A a rotary motion is im-. parted to the shaft C by the wheels D E.

F represents a bevel-wheel mounted on the shaft C, and meshing with a bevel-wheel, G, which is secured to a vertical shaft, 7i. The latterisjournaled in an adjustable frame, Lwhich is arranged to slide on the shaft C and bar b. The shaft C is provided with a longitudinal groove or keyway, t', into which projects a set screw or key, j, secured in the hub of the gear-wheel F, whereby the latter is compelled to rotate with the shaft C and permitted to move longitudinally on the same in adjusting the frame I on the bar b. The frame I is secured in place by a set-screw, il.

K represents a horizontal arm, which is secured by a set-screw, k, in a mortise formed in the lower end of the vertical shaft h. The arm K is preferably graduated, to facilitate its adjustment in the mortise.

Z represents the scriber, pen, pencil, or other suitable implement attached to one end of the arm K by a split socket, m, or other suitable holder with which the arm K is provided. The bevel-wheels D and E are of equal diameters, whereby the shaft Gis caused to make one vrevolution about its axis during one revolution of the frame B about the standard A. The bevel-wheel F is twice as large in diame ter as the wheel G, whereby the vertical shaft hand the scriber-arrn K, attached thereto, are caused to make two revolutions during one revolution of the shaft C and frame B.

In order to describe an ellipse of a given size, the frame I is adjusted so that the axis of the scriber-shaft h stands at adistance from the center of the standard A equal to half the sum of the semi-axes of the ellipse, and the scriber K is adjusted so that its point stands at a distance from the standard or center A equal to half the maj or diameter of the ellipse. The frame B is then swung around on the standard A, whereby the shaft G is caused to rotate and this movement of the shaft transmitted to the scrber Z by the gear-wheels C and D inthe proper manner to describe the desired ellipse.

By adjusting the arm K in the shaft vli and the frame I on the frame B ellipses of various sizes and forms may be readily described. If roo desired, the bar b may also be graduated," to facilitate the adjustment of the frame I.

I claim as my inventionl. The combination, with the standard A,

having a bevelwheel, E, rigidly secured 4 thereto, ofa frame, B, mounted on the standard A to turn on the same, a horizontal shaft,

C, journaled in the frame B and provided 5 with a bevel-wheel, D, meshing with the wheel E, and a bevel-wheel, F, a vertical shaft, h, provided with a hevel-wheel, G, meshing with the wheel F, and a horizontal seriher-arm, K, attached to the shaft 71., substantially as set forth.

2. The Combination, with the standard A, having a bevel-wheel, E, rigidly seen red thereto, of a frame, B, mounted on the standard A to turn on the same, a horizontal shaft, C, journaled in the frame B, a bevel-wheel, D, secured to the shaft C and meshing with the wheel E, a bevel-wheel, F, mounted on the shaft C to turn with the same, while being cal pable of adjustment lengthwise ot' the shaft, a frame, I, made lengthwise adjustable on the frame B, a vertical shaft, h, journaled in the frame l and carrying a hevelwheel, G, which meshes with the wheel F, and a seriher-arin, K, adjustably attached to the shaft 7L, suh- 25 stantially as set forth.

i ino` a bevel-wheel G which meshes with the wheel F, and a seriber-arm, K, adjustably s ecured in an opening in the shaft h, substan- 4o tially as set forth.

Vitness lmy hand this llth day of April, 1885.

C. F. GEYER, JNO. J. BONNER. 

